subarachnoid

American  

[suhb-uh-rak-noid] / ˌsʌb əˈræk nɔɪd /

adjective

Anatomy.

1. of, relating to, or situated below the arachnoid membrane.

---

Etymology

Origin of subarachnoid

First recorded in 1830–40; sub- + arachnoid

Example Sentences

Doctors found that he had suffered a subarachnoid hemorrhage resulting from a ruptured brain aneurysm.

From Slate • Dec. 8, 2025

Despite well-documented evidence of lymphatics aiding CSF clearance, identifying the exact anatomical connections between the subarachnoid space and extracranial lymphatics has posed a challenge due to their extremely complex structure.

From Science Daily • Jan. 26, 2024

Shortly after finishing the first season of "Game of Thrones" in 2011, Clarke experienced a subarachnoid hemorrhage, a bleed in the space between the brain and surrounding membrane.

From Salon • Jul. 18, 2022

Sigounas said Van Hollen experienced what’s called a “perimesencephalic subarachnoid hemorrhage” — essentially, he said, a small tear in a vein near the midbrain.

From Washington Post • Jun. 8, 2022

Here is the "island of Reil," here the "pons Varolii"; here is the "arbor vitæ"; and here is the "subarachnoid space"; and here that wonderful contrivance of the great Designer that regulates the arterial supplies.

From My New Curate by Sheehan, Patrick Augustine